Illinois Gas Prices
Average price per gallon in Illinois, updated 7/22/26 from AAA. Regular is currently $4.21/gal — $0.15 above the national average of $4.06.
Regular
$4.21
Mid-grade
$4.79
Premium
$5.32
Diesel
$5.06
Regular, change:▲ +$0.04 today▲ +$0.15 wk▼ $0.03 mo
Regular — recent trend (43 days)
Cheapest metros in Illinois
| Metro | Regular | Diesel |
|---|---|---|
| Quincy | $4.03 | $4.80 |
| Champaign-Urbana | $4.08 | $4.86 |
| Kankakee-Bradley | $4.09 | $5.00 |
| Danville | $4.11 | $4.99 |
| Lake County | $4.12 | $5.04 |
| Decatur | $4.13 | $4.92 |